Re: [Xen-devel] xen-hypervisor-4.3-amd64 4.3.0-3+b1 -> Intel M/B, I/O virt. enabled, start vm -> Kernel panic

[Jo Mills <jo@xxxxxxxxxxxxxxxx>]

On Thu, May 22, 2014 at 05:47:45AM -0400, Konrad Rzeszutek Wilk wrote:
> On Wed, May 21, 2014 at 10:42:30AM +0100, David Vrabel wrote:
> > On 20/05/14 19:41, Jo Mills wrote:
> > > On Tue, May 20, 2014 at 05:20:10PM +0100, David Vrabel wrote:
> > >> On 20/05/14 11:18, Ian Campbell wrote:
> > >>> On Tue, 2014-05-20 at 11:14 +0100, David Vrabel wrote:
> > >>>> On 17/05/14 18:46, Jo Mills wrote:
> > >>>>>
> > >>>>>     [  498.336430] ---[ end trace b9630577ecf84cd8 ]---
> > >>>>>     [  498.340053] Kernel panic - not syncing: Fatal exception in 
> > >>>>> interrupt
> > >>>>>     (XEN) Domain 0 crashed: 'noreboot' set - not rebooting.
> > >>>>
> > >>>> We need the full backtrace from the kernel.
> > >>>
> > >>> It was in the attached serial console log. I've pasted what I think is
> > >>> the relevant bit below.
> > >>
> > >> Ah. I hadn't noticed the attachment.
> > >>
> > >>> [  485.048066] d-con vm-13-disk2: PingAck did not arrive in time.
> > >>> [  486.876191] e1000 0000:04:02.0 eth2: Detected Tx Unit Hang
> > >>> [  486.876191]   Tx Queue             <0>
> > >>> [  486.876191]   TDH                  <a5>
> > >>> [  486.876191]   TDT                  <b5>
> > >>> [  486.876191]   next_to_use          <b5>
> > >>> [  486.876191]   next_to_clean        <a5>
> > >>> [  486.876191] buffer_info[next_to_clean]
> > >>> [  486.876191]   time_stamp           <10000b439>
> > >>> [  486.876191]   next_to_watch        <a6>
> > >>> [  486.876191]   jiffies              <10000b67f>
> > >>> [  486.876191]   next_to_watch.status <0>
> > >>
> > >> This looks like an e1000 driver/hardware problem.  It doesn't
> > >> immediately look Xen specific.
> > >>
> > >> David
> > > 
> > > Hi David et al,
> > > 
> > > Many thanks for your replies and for your time spent looking into this 
> > > problem.  
> > > 
> > > I probably should have mentioned in my report that when BIOS settings:
> > > 
> > >     Intel(R) Virtualization Technology
> > >     Intel(R) VT for Directed I/O
> > >     
> > > are enabled, creating VMs that do not use a pci passthrough device 
> > > works just fine.  It's only when I try and create a VM that does use a 
> > > pci passthrough device that the crash happens.  Whether this is 
> > > relevant or not I'm not competent enough to say.
> > 
> > It's not obviously related since it's a device/driver in dom0 that's
> > broken.  I would suggest asking the e1000 maintainers if the Tx Unit
> > Hang debug output hints at anything.
> 
> Lets CC them.
> 
> The thread is also available at:
> http://lists.xen.org/archives/html/xen-devel/2014-05/msg02259.html
> 
> Thank you!


Hi Konrad et al,

I mailed e1000-devel@xxxxxxxxxxxxxxxxxxxxx last night:

    Date: Wed, 21 May 2014 21:18:26 +0100
    To: e1000-devel <e1000-devel@xxxxxxxxxxxxxxxxxxxxx>
    User-Agent: Mutt/1.5.21 (2010-09-15)
    From: Jo Mills <jo@xxxxxxxxxxxxxxxx>
    Subject: linux-image-3.13-1-amd64  3.13.10-1, Intel M/B, \
                    I/O virt. enabled, start vm -> e1000 "Tx Unit Hang"

with the same information as I raised with xen-devel.  I did think 
carefully about CC'ing xen-devel, but decided it probably wasn't 
reasonable to include yet another copy of my bug report here. I was 
going to update the xen-devel list when I heard back from the e1000 
maintainers. 

Thanks again for your interest and support,

Best regards,

Jo.

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